Ring Main Unit

RM6 Merlin Gerin

24 kV

Catalog

2003
Telecontrol of power
distribution networks

Easergy T200: an interface designed

for telecontrol of MV networks
Easergy T200 is a "plug and play" or multifunction interface that integrates all the
functional units necessary for remote supervision and control of the RM6:
b acquisition of the different types of information: switch position, fault detectors,
current values...
b transmission of switch open/close orders,
b exchanges with the control center.
Required particularly during outages in the network, Easergy T200 is of proven
reliability and availability, being able to ensure switchgear operation at any moment.
It is simple to set up and to operate.

Functional unit designed for the Medium Voltage network

b Easergy T200 is designed to be connected directly to the MV switchgear, without
requiring a special converter.
b It has a simple front plate for local operation, which allows management of
electrical rating mechanisms (local/remote switch) and display of information
concerning switchgear status.
b It has an integrated MV network fault current detection system (overcurrent and
zero sequence) with detection set points that can be configured channel by channel
(current value and fault current duration).

Local informations Monitoring and control

Medium Voltage switchgear operating guarantee

b Easergy T200 has undergone severe MV electrical stress withstand tests.
b It is a backed up power supply which guarantees continuity of service for several
hours in case of loss of the auxiliary source, and supplies power to the Easergy T200
and the MV switchgear motor mechanisms.
Ready to plug
b Easergy T200 is delivered with a kit that makes it easy to connect the motor
mechanisms and collect measurements.
b The telecontrol cabinet connectors are polarized to avoid any errors during
installation or maintenance interventions.
b Current measurement acquisition sensors are of the split type, to facilitate their
installation.
Power supply Polarized connectors

Position of the RM6

RM6 switchgear is perfectly adapted to the telecontrol context,
Split sensors thanks to options such as:
b integrated voltage transformer, for independent supply to auxiliaries,
b Easergy T200 telecontrol interface,
b electrical rating mechanism,
b auxiliary fault and position indication contacts,
b current sensors for fault detection.

Schneider Electric RM6 range 7

Main characteristics

Description of RM6 switchgear

RM6 switchgear comprises 1 to 4 integrated, low dimension functional units.
This self-contained, totally insulated unit comprises:
b a stainless steel, gas-tight metal enclosure, sealed for life, which groups together
the live parts, switch-disconnector, earthing switch, fuse switch or the circuit breaker,
b one to four cable compartments with interfaces for connection to the network or to
the transformer,
b a low voltage compartment,
b an electrical operating mechanism compartment,
b a fuse chamber compartment for fused switch-disconnectors or fuse switches.

The performance characteristics obtained by the RM6 meet the definition of a

"sealed pressure system" laid down in the IEC recommendations.
The switch-disconnector and the earthing switch offer the operator all necessary
usage guarantees:
Tightness
The enclosure is filled with SF6 at a 0.2 bar gauge pressure. It is sealed for life after
filling. Its tightness, which is systematically checked at the factory, gives the
switchgear an expected lifetime of 30 years. No maintenance of live parts is
necessary with the RM6 breaking.
Switch disconnector
Electrical arc extinction is obtained using the SF6 puffer technique.
Circuit breaker
Electrical arc extinction is obtained using the rotating arc technique plus SF6
auto-expansion, allowing breaking of all currents up to the short-circuit current.

Network
Selection of functions
switch-disconnector I The range offers the user a selection of non extensible RM6 combinations with
1, 2, 3 and 4 functional units.
Transformer feeder Adaptable to all requirements, this makes it possible to choose the transformer
fuse-switch combination Q feeder protection:
b switch-disconnector combined with fuses,
b or 200A circuit breaker.
Transformer feeder 200 A It also allows the protection of secondary MV rings using 630A circuit breakers.
circuit breaker D
Most of this switchgear exists in versions that are extensible on the right or on both
sides, in order to provide for future development of the network.
Line feeder 630 A
circuit breaker B

Telecontrol power
supply transformer T

Designation of different switchgear

type of tank function configuration
NE: non extensible I I I I
RE: extensible on the right Q Q
DE: module that is extensible D D
on the right or the left B B
T

Example of designation
RM6 NE-IQI
RM6 RE-DIDI

8 RM6 range Schneider Electric

Main characteristics

Table of electrical characteristics

Rated voltage (kV) 12/17.5 24
insulation level
industrial frequency 50 Hz 1 mn (kV eff.) 28/38 50
impulse 1,2/50 µs (kV crête) 75/95 125
Network-switch
rated current (A)(1) 630 630 400 630 630
breaking capacity (A)(1) charging current 630 630 400 630 630
earth leakage fault 95 95 95 95 95
no-load cable 30 30 30 30 30
short-time withstand current (kA eff. 1 s)(2) 21 25(4) 16 16 20
making capacity of switch 52.5 62.5(4) 40 40 50
and earthing switches (kA peak)
Transformer feeder
rated current (A) 200 200 200 200 200
off-load transformer laking capacity (A) 16 16 16 16 16
Fuse-switch
short-circuit breaking capacity (kA)(3) 21 25(4) 16 16 20
making capacity (kA peak)(3) 52,5 62.5(4) 40 40 50
Circuit breaker
short-circuit breaking capacity (kA) 21 25(4) 16 16 21
making capacity (kA peak) 52.5 62.5(4) 40 40 52.5
Line protection feeder
rated current (A) 630 630
short-circuit breaking capacity (kA) 21 25(4) 16 21
making capacity (kA peak) 52.5 62.5(4) 40 52.5

1) In accordance with IEC guidelines, these characteristics are

valid for ambient temperatures of between -25°C and +40°C Standards
(class: -25°C). RM6 meets international standards:
For higher temperatures, the permissible current (in A)
becomes:
Normal operating conditions for indoor switchgear as laid down by
Temperature 40°C 45°C 50°C 55°C IEC 60694 : Common specifications for hight-voltage switchgear and
Indoor installation 400 400 400 355 controlgear standards.
630 575 515 460 b Ambient temperature: class -25 indoors
(2) For 3 sec. thermal withstand, please consult us. v lower than or equal to 40°C.
(3) Prospective value, the actual current being limited v lower than or equal to 35°C on average over 24 hours.
by the fuse. v greater than or equal to - 25°C.
(4) Limited to 12 kV. b Altitude:
v lower than or equal to 1000 m,
v above 1000 m, and up to 3000 m, with directed field connections.
b Breaking capacity:
RM6 switch-disconnectors are "E3/M1 class switch-disconnectors" which are in
conformity with IEC standard 60265, i.e., : Hight voltage switches for rated
voltages of 52kV and above.
v 100 CO cycles at rated current and 0.7 p.f.,
v 1000 mechanical opening operations.
200 and 630 A circuit breakers are designed to carry out:
IEC 62271-100 (to replace IEC 60056) : Hight-voltage alternating current circuit
breakers.
v 2000 mechanical opening operations, in conformity with IEC standard 60056,
v 3 OC cycles at short-circuit current.

Other standards :
IEC 60298 : A.C. metal-enclosed switchgear and controlgear for rated voltage above
1kV and up to including 52kV.
IEC 60420 : Hight voltage alternatif current switch-fuse combinations.
IEC 60255 : Electrical relays.
IEC 62271-102 (to replace IEC 60129) : Hight-volatge alternating current
disconnectors and earthing switches.

Schneider Electric RM6 range 9